Abstract

High-order dispersion in the slow-light regime of photonic crystal (PhC) waveguides was measured by utilizing integrated Mach-Zehnder interferometer (MZI) structures, and compared with theoretical results obtained from 3D plane-wave calculations. Highly accurate measurements of group-velocity dispersion (GVD), third-order dispersion (TOD) and fourth-order dispersion (FOD) at high group-index (ng) values were enabled by minimizing external phase-distortions and increasing signal-to-noise ratio in the MZI. The experimental results for GVD, TOD, and FOD parameters at ng~100 were ~102ps2/mm, ~104ps3/mm, and ~105ps3/mm respectively. The results emphasize the importance of taking into consideration the effect of TOD and FOD on pulse broadening in the slow-light regime.

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